Refactor MeshInstance

src/Runtime/Ghost.Engine/Components/MeshInstance.cs

@@ -1,47 +1,15 @@
 using Ghost.Core;
 using Ghost.Entities;
 using Ghost.Graphics.Core;
-using Misaki.HighPerformance.LowLevel.Collections;
 
 namespace Ghost.Engine.Components;
 
-public struct MeshPalette : ISharedComponent, IEquatable<MeshPalette>
-{
-    public UnsafeArray<Handle<Mesh>> meshes;
-    public UnsafeArray<Handle<Material>> materials;
-
-    public bool Equals(MeshPalette other)
-    {
-        throw new NotImplementedException();
-    }
-
-    public override int GetHashCode()
-    {
-        throw new NotImplementedException();
-    }
-
-    public override bool Equals(object? obj)
-    {
-        return obj is MeshPalette palette && Equals(palette);
-    }
-
-    public static bool operator ==(MeshPalette left, MeshPalette right)
-    {
-        return left.Equals(right);
-    }
-
-    public static bool operator !=(MeshPalette left, MeshPalette right)
-    {
-        return !(left == right);
-    }
-}
-
 public struct MeshInstance : IComponent
 {
-    public int meshIndex;
-    public int materialIndex;
+    public Handle<Mesh> mesh;
+    // NOTE: This will be the first material, we can access other materials by the bindless index of the first material + the local index stored in the meshlet.
+    public Handle<Material> materialStart;
     public ShadowCastingMode shadowCastingMode;
     public RenderingLayerMask renderingLayerMask;
-    public byte subMeshIndex;
     public bool staticShadowCaster;
 }

src/Runtime/Ghost.Engine/Systems/RenderExtractionSystem.cs

@@ -3,7 +3,6 @@ using Ghost.Engine.Components;
 using Ghost.Entities;
 using Ghost.Graphics.Core;
 using Misaki.HighPerformance.LowLevel.Buffer;
-using Misaki.HighPerformance.LowLevel.Utilities;
 
 namespace Ghost.Engine.Systems;
 
@@ -14,7 +13,6 @@ public class RenderExtractionSystem : ISystem
     public void Initialize(ref readonly SystemAPI systemAPI)
     {
         _queryID = new QueryBuilder()
-            // TODO: We also need to filter by MeshPalette.
             .WithAll<MeshInstance, LocalToWorld>()
             .Build(systemAPI.World);
     }
@@ -30,6 +28,7 @@ public class RenderExtractionSystem : ISystem
         var renderList = new RenderList(1, 64, Allocator.Temp);
 
         // TODO: We should extract the render record for each camera because different cameras may have different culling results.
+        // TODO: This chould be done in parallel jobs.
         foreach (var chunk in query.GetChunkIterator())
         {
             var meshInstances = chunk.GetComponentData<MeshInstance>();
@@ -47,7 +46,6 @@ public class RenderExtractionSystem : ISystem
                     // mesh = meshInstance.meshIndex,
                     // material = meshInstance.materialIndex,
                     renderingLayerMask = meshInstance.renderingLayerMask,
-                    subMeshIndex = meshInstance.subMeshIndex,
 
                 }, 0);
             }